Yesterday we hiked the non-drivable portion of the Arroyo-Seco Indians Road, from the Arroyo Seco Campground to Escondido Campground. It is still passable to bikes. The Jan/Feb 2017 storms caused several new slides, but none are currently dangerous. None of the old slides appeared less stable, and in fact the longest slide had a better tread for walking across than it had in prior years. There was nothing that felt risky or dicey. There are a dozen or two spots where one would need to hike-a-bike across a 10-100 foot obstacle.
To be clear, this road is cut into a very steep hillside, and if the road is ever completely undermined it will pose an obstacle that is impossible to pass with a bike, or even on foot, as one can not simply skirt above or below a slide.
Measured from the Arroyo Seco campground, all of the slides are located between mile 2.6 and mile 7.5. The only piece of the road that has vegetation growing in the roadbed is between mile 6 and mile 7.5; north of mile 6 and south of mile 7.5 was graded and cleared as part of the firefighting effort in 2016. Note that the two slides near mile 2.6 are very new, and the USFS can no longer get vehicles past those slides.
Jim and I took photos of some of the obstacles, and when we have time we'll add more waypoints to our CalTopo map and photos and descriptions to the route guide -
http://doingmiles.com/2010-03-wildflowers/.
